tonsil BTO:0001387 CALOHA:TS-1053 EFO:0001401 EMAPA:35871 EV:0100052 FMA:9609 GAID:341 MA:0000143 MESH:A03.867.603.925 Mandel OpenCyc:Mx4rvVivrZwpEbGdrcN5Y29ycA UBERON:0002372 UMLS:C0836921 UMLS:C1519547 UMLS:C1519548 VHOG:0001139 either of the two small almond-shaped masses of lymph tissue found on either side of the oropharynx the term 'tonsil' can be ambiguous, sometimes refering specifically to the palatine tonsil, sometimes generically to include the cecal tonsils of avians. This class represents lymphoid tissue that is part of the tonsillar ring, in the mouth/throat region uberon endoderm-derived structure epithelium-associated lymphoid tissue